<html>
  <head>
    <title>OK</title>
    <link rel="icon" id="fi" type="image/png" href="favicon.png"/>
  </head>
<body>
Basic html test.
</body>
<script>
setTimeout(() => {
  const link = document.getElementById('fi');
  document.head.removeChild(link);
}, 5000);
</script>
</html>
